Editing Safe torque off
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[[File:sto.jpg|thumb|Motor velocity decaying to zero after STO has been activated.]] | [[File:sto.jpg|thumb|Motor velocity decaying to zero after STO has been activated.]] | ||
− | Safe torque off a.k.a. STO is a motor drive function that disables drive's ability to | + | Safe torque off a.k.a. STO is a motor drive function that disables drive's ability to direct any torque inducing power to the motor and also prevents unintentional motor power-up. STO is built with [https://en.wikipedia.org/wiki/Redundancy_(engineering) redundancy] a way that guarantees the torque removal torque even in the case of single failure of any component of the system. |
==Usefulness== | ==Usefulness== | ||
Built-in STO in drive provides following | Built-in STO in drive provides following | ||
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*Simplify wiring | *Simplify wiring | ||
;Cons | ;Cons | ||
− | *Most STO implementations not safe with brush DC motors and also may cause AC motor to lock-up in certain magnetic pole angle | + | *Most STO implementations not safe with brush DC motors and also may cause AC motor to lock-up in certain magnetic pole angle |
==STO in Argon servo drive== | ==STO in Argon servo drive== | ||
[[Argon (servo drive)]] has 4-way STO function making it one of the most fail safe implementations available. Safety is being provided by four simultaneous actions: | [[Argon (servo drive)]] has 4-way STO function making it one of the most fail safe implementations available. Safety is being provided by four simultaneous actions: | ||
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*Activating dynamic braking of motor | *Activating dynamic braking of motor | ||
*Software (firmware) disabling motor control | *Software (firmware) disabling motor control | ||
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